What is the primary feature that distinguishes an open circulatory system from a closed circulatory system?

  • A
    Presence or absence of a heart.
  • B
    Whether the blood flows through vessels or into open body cavities (sinuses).
  • C
    The type of respiratory pigment present in the blood.
  • D
    The presence or absence of blood cells.

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Similar Questions

How many double circulations are normally completed by the human heart in one minute?

In an open circulatory system:

Incomplete circulation is found in
$I$. Reptiles
$II$. Amphibians
$III$. Birds
$IV$. Mammals
The correct option is:

Which vessel carries sugars from the digestive system to the liver?

For reaching the left side of the heart,blood must pass through:

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